# Irradiation of 300 m phi detectors from MICRON and HAMAMATSU cont. Second independent estimate: 6h 2 cycles, 12h 1 cycle, 14h no beam, 5.5h 1cycle estimated.

## Presentation on theme: "Irradiation of 300 m phi detectors from MICRON and HAMAMATSU cont. Second independent estimate: 6h 2 cycles, 12h 1 cycle, 14h no beam, 5.5h 1cycle estimated."— Presentation transcript:

Irradiation of 300 m phi detectors from MICRON and HAMAMATSU cont. Second independent estimate: 6h 2 cycles, 12h 1 cycle, 14h no beam, 5.5h 1cycle estimated fluence by program assuming constant flux = real fluence / 1.37 Best estimate: real fluence = (1.5 +/- 10%) measured fluence Best estimate: real fluence = (1.5 +/- 10%) measured fluence

Irradiation of 300 m r detector from MICRON 12 July 18:30, Calibration of beam w/o detector SEC=2.71 10 6, fluence = 0.16 10 14 p/cm 2 F- factor = 5.9 10 6 Estimate SEC=50.8 10 6 for 3 10 14 p/cm 2 20:45, Start irradiation with detector 13 July 17:15, stop SEC=49.2 10 6 Highest fluence measured 2.93 10 14 p/cm 2 F- factor = 6.0 10 6 No complication with 1 and 2 cycles, only 30min stop of PS measured fluence is OK

Irradiation of 300 m phi detectors from MICRON and HAMAMATSU cont. Al for profile measurement and final calibration total time: 39h, first 6 h: 2 cycles, 14 h with no beam numbers given by program are completely unreliable Try to get correct estimate: Need to assume that the beam detector didnt changed, ( 2 cycles/ 1 cycle, shuttle problem, PS camera for beam steering ) 1. Add different calibrations: 1+3+4 = 4.5 10 14 p/cm 2 4.5 / 2.8 = 1.6 ? (assumes Al foil for calibration was in the center of the beam) Correction for 6h 2cycles and 12h 1cycle on calibration 3: 3.35 10 14 p/cm 2 3.68 10 14 p/cm 2

Irradiation of 300 m phi detectors from MICRON and HAMAMATSU 26 July 16:55, Detectors + Al foils in beam First calibration 16:55 - 18:15 SEC=2.769 10 6, fluence = 0.14 10 14 p/cm 2 F-factor = 5.1 10 6 Second calibration 18:38 - 27 July 10:38 SEC=71.98 10 6, fluence = 2.14 10 14 p/cm 2 F-factor = 3.1 10 6 !!!! (this calibration was used to define final SEC counts for 3 10 14 p/cm 2 to be 98.87 10 6 ) Third calibration 18:38 - 27 July 12:48 SEC=76.15 10 6, fluence = 3.35 10 14 p/cm 2 F-factor = 4.6 10 6 (nobody noticed fluence > 3 10 14 p/cm 2 ) Fourth calibration 28 July 2:33 - 8:12 SEC=89.69 10 6, fluence = 0.71 10 14 p/cm 2 F-factor = 5.2 10 6 additional complications: First 6 h with 2 cycles, irradiation stopped 27 July 12:48 - 28 July 2:33

Irradiation of 200 m phi detector from MICRON 28 July 12:50, Detector + Al foils in beam Calibration starts at 14:26, SEC=2.013 10 6 Calibration stops at 16:05, SEC=5.265 10 6 measured fluence = 0.213 10 14 p/cm 2 SEC = 3.252 10 6 F-factor = 6.5 10 6 (normal) wanted 5 10 14 p/cm 2 SEC = 81.6 10 6 instead goal set to: SEC = 150 10 6 ! Explains factor 2 higher dose 29 July 13:32, irradiation stops, SEC = 146.3 10 6 Minor correction: 5 hours 1 cycle, 19 hours 3 cycles real fluence 9% less than estimated by program divide all numbers by 1.09

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